On what basis are they similar? I have a MBP and have demoed the U310. In my estimation, they are almost nothing alike, even the look doesn't seem very similar to me… certainly less than some of the other Ultrabooks, like the Zenbook, for example.

??? I think you might be confused... the Zenbook isn't even the same shape, and the Zenbook has a spun design on the lid and the MBP doesn't.

The closed u310 is with the white interior, if you find one with the silver interior it looks much more similar as well. It is pretty much as close as you can get without Apple crying about their patents on rounded corners.